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x in (-oo:+oo)
-23/40 = (4/5)*x+(3/4)*x+1/5 // - (4/5)*x+(3/4)*x+1/5
-((4/5)*x)-((3/4)*x)-23/40-(1/5) = 0
(-4/5)*x+(-3/4)*x-23/40-1/5 = 0
-31/20*x-31/40 = 0 // + 31/40
-31/20*x = 31/40 // : -31/20
x = 31/40/(-31/20)
x = -1/2
x = -1/2
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